Matrix for vulcanizers



F. MAIER.

MATRIX FOR VULCANIZERS.

APPLICATION FILED MAY 14, 1919.

1,380,919, Patentediune 7,1921,

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FRED MAIER, OF LOS ANGELES, CALIFORNIA, ASSIGNOR 'IO WESTERN VU'LGANIZER MANUFACTURING COMPANY, OF CHICAGO, ILLIN'QIS, A. COPARTNESHIP CONSIST- ING OF HERBERT K. WHEELOGK, FRANK A. WELLER, AND WALTER R. FON'IAIN E.

MATRIX FOR v'UIicANIzERs.

In the art of vulcanizing as especially applied to retreading tires, a removable matrix, preferably made of aluminum or other readily heat-conducting and non-corrosive metal, is often used in a mold of standard design, so that when it is desired to change the design of the article tobe vulcanized, a new matrix may be substituted to accomplish this purpose.

In retreaders for tires, the vulcanizing bed is concave and of arcuate form to conform to the shape of the tire, a removable matrix being contained within this vulcanizing bed. The heat for the vulcanizing op-v eration is supplied by steam in a chamber adjacent to the walls of the vulcanizing bed or by other suitable heating means, so that the heat passe through the matrix and per forms the vulcanizing operation upon the tire.

It has proved very difiicult and expensive to make a matrix having relatively complicated configurations thereon in order to give a correspondingly complicated design to the tread of a tire. These designs are of such nature that it is exceedingly difficult to satisfactorily cast a matrix in finished form with all the surfaces of the configurations free from blow-holes and other imperfections.

.It is the object of my invention to make) a matrix having configurations thereon by va simple and relatively inexpensive process,-

which will greatly improve the finished matrix.

In order that my invention may be more Specification of Letters Patent.

Patented June 7, 1921.

Application filed May 14, 1919. Serial No. 296,985. I

readily understood, reference is made to the accompanying drawings, in which Figure 1 is a plan of a portion of a matrix showing the configurations thereon; and

Fig. 2 is a transverse section taken on the line 2-2 of Fig. 1.

In order to simplify the process of making the matrix indicated as a whole by 10, it is preferably made in the two longitudinally separated halves 11', which abut at their adjoining edges 12. The matrix as a whole is concave in cross section and longi tudinally arcuate, so as to conform to the outside of the tire which is to be vulcanized.

The two halves 11, 11 vof the matrix when first cast have a relatively plain inner surface. The configurations, such as 13 and 14 shown in the drawings, are preferably made of type metal or other similar metal having a relatively low melting point, these configurations being provided with the lugs 15 extending into the beveled holes 16 in the matrix. 1

It will be observed that the holes 16 are made with ends of least cross sectional area at the inner sur face of the matrix, so that the lugsl5 which fill these holes serve to securely anchor the configurations 13 and 14 in position. The holes 16 preferably extend through the wall of the matrix, but, if desired, these holes may extendonly from the inner surface of the matrix, terminating before they reach the outer convex surface thereof. I

In the process of applying the configurations, the holes 16 are first made in the matrix, which is preferably of aluminum or other similar heat-conducting and non-corrosivemetal, and a suitable mold for the configurations is then applied to the inner surface of the matrix. The type metal of poured into the mold either by directly pouring the same into the mold if the holes 16 do not extend to the outer surface of the .matrix, or by pouring through the holes 16 which the configurations are formed is then the castings are smoothed off. The mold may till be of any desired material such as is well known in the art; and the casting may either be formed under pressure or not, as desired. It is also within the discretion of the operator whether a single configuration or a plurality should be cast at the same time.

It will be apparent that by means" of the process which have described, the matrix is very quickly and easily supplied with configurations of any desired design, these on to said body portion and. engaging the.

said anchoring surface.

2. A matrix for vulcanizers, consisting of a main body portion and having an anchoring hole therein, and a configuration cast on said body portion and having a portion extending into said anchoring hole, whereby the configuration is secured to said body portion.

3. A matrix for vulcanizers, consisting of a main body portion having a relatively plain surface and with. a beveled anchoring hole extending into the wall of said matrix from said surface, and a configuration cast on said surface and having a portion extending into said hole, whereby the configuration is securely fastened in position.

4. A matrix for vulcanizers, consisting of a main body portion having a concave surface, a plurality of beveled anchoring holes extending into said matrix from said concave surface, and a plurality of configurations cast on said concave surface and having portions extending into said anchoring holes, whereby said configurations are securely fastened .to said matrix.

5. A matrix for vulcanizers, comprising a metallic body portion having anchoring holes extending inwardly from one surface thereof, and a plurality of metallic configurations cast on said matrix and having portions extending into said anchoring holes.

6. A matrix for vulcanizers, comprising an aluminum body portion having an anchoring hole extending inwardly from one surface thereof, and a configuration of readily fusible metal cast on saidsurface and having a portion extending into said anchoring hole.

7. 'A matrix for tire retreaders, consisting of an aluminum body portion having a concave surface from which a beveled anchoring hole extends, and a type metal configuration cast'on said concave surface and having a portion extending into said anchoring hole, whereby said configuration is securely fastened to said body portion.

Signed at Chicago, Illinois, this 5th day of May, 1919.

FRED MAIER 

